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Strange signals picked up from black holes and distant supernovae suggest there's more to space-time than Einstein believed.
- Strange signals picked up from black holes and distant supernovae suggest there's more to space-time than Einstein believed
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GPS is handy for finding a route, but it might be able to solve fundamental questions in physics too. An analysis of GPS satellite orbits hints that Earth is heavier than thought, perhaps due to a halo of dark matter.
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